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Posted to commits@doris.apache.org by GitBox <gi...@apache.org> on 2022/05/27 08:18:50 UTC
[GitHub] [incubator-doris] adonis0147 opened a new issue, #9808: [feature-wip](array-type) Support array type which doesn't contain null
adonis0147 opened a new issue, #9808:
URL: https://github.com/apache/incubator-doris/issues/9808
### Search before asking
- [X] I had searched in the [issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and found no similar issues.
### Description
This issue is a subtask of https://github.com/apache/incubator-doris/issues/7570 .
It proposes an approach to distinguish two array types:
1. An array type which doesn't contain null values.
2. An array type which contains null values.
Some other softwares have similar features.
**ClickHouse**
See [Array(t)](https://clickhouse.com/docs/en/sql-reference/data-types/array/)
Examples:
1. Array(UInt8)
2. Array(Nullable(UInt8))
**Spark**
See [ArrayType](https://sparkbyexamples.com/spark/spark-array-arraytype-dataframe-column)
Examples:
1. DataTypes.createArrayType(StringType)
2. DataTypes.createArrayType(StringType, false) - `false` here indicates the type doesn't contain null values.
## Proposed syntax
1. ```ARRAY<TYPE>``` - contains null by default (behaves like Spark and Postgres)
2. ```ARRAY<NOT_NULL(TYPE)>``` - doesn't contain null
### Use case
```shell
mysql> create table array_type_table(k1 INT, k2 Array<not_null(int)>) duplicate key (k1)
-> distributed by hash(k1) buckets 1 properties('replication_num' = '1');
```
### Related issues
#7570
### Are you willing to submit PR?
- [X] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)
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[GitHub] [incubator-doris] morningman closed issue #9808: [feature-wip](array-type) Support array type which doesn't contain null
Posted by GitBox <gi...@apache.org>.
morningman closed issue #9808: [feature-wip](array-type) Support array type which doesn't contain null
URL: https://github.com/apache/incubator-doris/issues/9808
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